4.7 Article

Engineering sodium-rich manganese oxide with robust tunnel structure for high-performance sodium-ion battery cathode application

期刊

CHEMICAL ENGINEERING JOURNAL
卷 417, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.128097

关键词

Sodium-ion battery; Cathode material; Tunnel structure; Sodium-based manganese oxide; Tolerance of deformation

资金

  1. National Key R&D Program of China [2018YFB0905400, 2019YFA0210300]
  2. Hunan Provincial Natural Science Foundation of China [2019JJ40359]
  3. Hunan Provincial ST Plan of China [2017TP1001, 2016TP1007]
  4. CSU Postgraduate Innovation Research Project [2020zzts410]
  5. Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University [CSUZC2020016]

向作者/读者索取更多资源

A novel sodium-rich tunnel-type Na0.6MnO2 material was reported in this study, fancily prepared with the guidance of CTAB surfactant, exhibiting outstanding cycling durability and high discharge capacity. The sodium-rich tunnel-structured manganese oxide provides a new perspective for engineering high-performance SIB cathode materials.
Layer sodium-based manganese oxides are one of potentially applicable sodium-ion battery (SIB) cathode materials mainly because of their lower cost and relatively reversible Na+ intercalation/extraction attributes. However, unavoidable Jahn-Teller effect arisen from manganese redox reactions causes serious lattice distortion, leading to distinct capacity fade. NaxMnO2 (x < 0.44) with tunnel structure shows good tolerance of deformation, but its intrinsically low sodium compositions determine its limited capacity. Herein, we report a novel sodium-rich tunnel-type Na0.6MnO2 material fancily prepared with the guidance of cetyltrimethylammonium bromide (CTAB) surfactant. Due to the robust structure and high sodium contents, the tailored CTAB-Na0.6MnO2 exhibits outstanding cycling durability with high discharge capacity. The fast Na+ diffusion kinetics and the restorable framework during charge/discharge cycling are further approved by galvanostatic intermittent titration technique (GITT) and ex situ x-ray diffraction (XRD) techniques. The sodium-rich tunnel-structured manganese oxide provides a new perspective of engineering high-performance SIB cathode materials.

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